Preparation of reduced tantalum pentoxide by electrochemical technique for oxygen reduction reaction
Preparation of reduced tantalum pentoxide by electrochemical technique for oxygen reduction reaction
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DOI：
10.1016/j.jpowsour.2014.06.102
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发表时间：
2014-12
影响因子：
9.2
通讯作者：
Zaenal Awaludin;T. Okajima;T. Ohsaka
中科院分区：
文献类型：
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作者：
Zaenal Awaludin;T. Okajima;T. Ohsaka
A non-Pt based electrocatalyst, tantalum oxide (TaOx) deposited on glassy carbon, for oxygen reduction reaction (ORR) in acidic solutions was prepared by electrochemical technique. The tantalum pentoxide (Ta2O5) formed on the as-prepared deposits was electrochemically reduced to generate its reduced species which conventionally need a heat treatment under H2atmosphere. The reduced Ta2O5shows a fairly high onset potential of ORR (0.87 V vs. RHE) in comparison with that (0.98 V) at a commercially available Pt/C catalyst. The ORR performance of the TaOxwas investigated using a rotating ring-disk electrode voltammetry showing that a four-electron ORR takes place actually at potential above ca. 0.8 V and a two-electron ORR becomes significant gradually as the potential is increased negatively.
